cleg vs deerfly

cleg

noun
  • A blood-sucking fly of the family Tabanidae; a gadfly, a horsefly. 

  • A light breeze. 

deerfly

noun
  • Any of various species of fly which feed on deer, principally in genus Chrysops. 

How often have the words cleg and deerfly occurred in a corpus of books? (source: Google Ngram Viewer )